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单分散聚甲基丙烯酸甲酯微球为模板制备大孔氧化铝材料
张 勇, 孔庆岚, 刘芝平, 延姗姗, 于 峰
太原理工大学 水利科学与工程学院,山西 太原 030024
摘要:
以过硫酸铵为引发剂、十二烷基硫酸钠为乳化剂、甲基丙烯酸甲酯为单体,通过乳液聚合制备了聚甲基丙烯酸甲酯(PMMA)乳胶微球。研究显示,通过改变合成体系中乳化剂用量可对合成的PMMA微球的粒径进行有效调控,并得到了粒径分布在200~300 nm的PMMA微球;通过破乳沉降法加速PMMA微球的自组装,得到紧密堆积的PMMA微球胶体模板。将溶解在乙醇(经盐酸酸化)中的异丙醇铝溶液填充到组装好的PMMA胶体模板剂的空隙中,通过焙烧去除模板制得大孔氧化铝材料,在950 ℃焙烧3 h得到了规整大孔γ-Al2O3;扫描电镜和透射电镜结果表明所得材料孔道丰富,为三维有序大孔材料。
关键词:  聚甲基丙烯酸甲酯微球  单分散  胶体模板  三维有序大孔材料
DOI:10.13218/j.cnki.csdc.2018.06.007
分类号:O631.2
基金项目:国家自然科学基金资助项目(21706176)
Preparation of macroporous aluminium oxide by using mono-dispersed PMMA microspheres as templates
Abstract:
Mono-dispersed polymethyl methacrylate (PMMA) latex microspheres were prepared by emulsion polymerization using methyl methacrylate as monomer, ammonium persulfate as initiator and sodium dodecyl sulfate as emulsifier. The results show that the particle size of the as-synthesized PMMA microspheres can be effectively controlled and adjusted by changing the content of emulsifier. The PMMA microspheres with diameter distribution of 200~300 nm were obtained. The self-assembly of PMMA microspheres was accelerated by demulsification sedimentation method so as to obtain a tightly packed PMMA microsphere colloidal template. The solution of aluminum isopropoxide dissolved in ethanol (acidified by hydrochloric acid) was filled into the interspaces of the PMMA colloidal template. The macroporous material of alumina was then obtained by roasting the template. γ-Al2O3 3DOM (3D ordered macroporous material) was obtained by calcination at 950 ℃ for 3 h. The results of SEM and TEM show that the material is 3DOM which has many porous channels.
Key words:  polymethyl methacrylate microsphere  mono-dispersed  colloidal template  three-dimensionally ordered macroporous material

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